st: right censoring of dependent and independent variable

I have data where both the dependent and independent variable are right censored and continuous. Although intreg, cnreg or tobit can handle censoring of the dependent variable, they do not seem to allow censoring of the independent variable. Both the instruments can only measure to a maximum value, 30% of values are right censored on the Y variable and 15% on the X variable.

I would welcome suggestions as to how to incorporate right censoring of the independent variable?